2178500820 has 96 divisors (see below), whose sum is σ = 6308305920. Its totient is φ = 561146880.

The previous prime is 2178500813. The next prime is 2178500827. The reversal of 2178500820 is 280058712.

It is an interprime number because it is at equal distance from previous prime (2178500813) and next prime (2178500827).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178500827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1771966 + ... + 1773194.

It is an arithmetic number, because the mean of its divisors is an integer number (65711520).

Almost surely, 2^2178500820 is an apocalyptic number.

2178500820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2178500820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3154152960).

2178500820 is an abundant number, since it is smaller than the sum of its proper divisors (4129805100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2178500820 is a wasteful number, since it uses less digits than its factorization.

2178500820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2225 (or 2223 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 2178500820 is about 46674.4129047169. The cubic root of 2178500820 is about 1296.3409572928.

The spelling of 2178500820 in words is "two billion, one hundred seventy-eight million, five hundred thousand, eight hundred twenty".